Mathematics · Reasoning
Refer to the given number series and answer the question that follows. Counting is to be done from left to right only. (Note: All numbers are single-digit numbers only.) (Left) 5 2 1 5 7 9 3 2 1 5 7 3 7 8 1 6 9 7 4 6 3 4 5 2 4 8 4 (Right) How many such even digits are there, each of which is immediately preceded by an odd digit and also immediately followed by an even digit?
- 14
- 21
- 32✓
- 43
Correct answer
2
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